Chauhanellus neotropicalis Domingues & Fehlauer, 2006

Chauhanellus neotropicalis: Domingues & Fehlauer (2006): 63 –65, figs. 1–7 (descr); Cohen & Kohn (2008): 8, 32 (citat); Kohn et al. (2013): 39, 135, fig. 137 (citat).

Type-host: Aspistor luniscutis (Valenciennes) .

Site of infection: Secondary lamellae of the gills.

Type-locality: Fish market, Municipality of Paranaguá, State of Paraná, Brazil.

Other records: Aspistor quadriscutis, Fish market, Municipality of Bragança, State of Pará, Brazil; Amphiarius rugispinis, Bombom Village, Municipality of Viseu, State of Pará, Brazil (01º11’48”N, 46º08’24” W); A. rugispinis, Fishing village of Ajuruteua, Municipality of Bragança, State of Pará, Brazil (0°49’31”N, 46°36'29"W); A. rugispinis, Fish market, Municipality of Bragança, State of Pará, Brazil; Notarius grandicassis, Bombom Village, Municipality of Viseu, State of Pará, Brazil; N. grandicassis, Fishing village of Ajuruteua, Municipality of Bragança, State of Pará, Brazil; N. grandicassis, Fish market, Municipality of Bragança, State of Pará, Brazil; Sciades passany, Fish market, Municipality of Bragança, State of Pará, Brazil; Sciades proops, Fishing village of Ajuruteua, Municipality of Bragança, State of Pará, Brazil; S. proops, Fish market, Municipality of Bragança, State of Pará, Brazil.

Prevalence of infection: 43 of 66 (65%) of A. quadriscutis; 23 of 28 (82%) of A. rugispinis; 17 of 19 (92%) of N. grandicassis; 100% of 84 S. proops; 12 of 13 (92%) of S. passany .

Remarks: The analysis of specimens of Chauhanellus parasitizing the gills of of A. quadriscutis, A. rugispinis, N. grandicassis, S. proops and S. passany indicated that they are conspecific with C. neotropicalis, based on the morphology of the male copulatory organ and haptoral structures. These specimens have a male copulatory organ with 1¼ counterclockwise rings and distal acute tip, ventral bar possessing postero-dorsal footlike protuberances, and dorsal bar with V-shaped with spine-like ends. The specimens collected from those hosts did not differ morphometrically from the type-host collected from the Brazilian Southern Coast, extending the distribution of C. neotropicalis to the North coast of Brazil.